Method and machine for straightening of metal wire



c. G. SDERLUND.

METHOD AND MACHINE FOR STRAIGHTENING 0F METAL WIRE.

APPLICATION FIL'EI) JUNE 7. B918.

Inven/vr lllNllTED STATES PATENT FFCE.

CARL GUsTAn sDEnLUND, or eofrfrnivnone, SWEDEN, Assrenon To AKTIEBOLAGET LIDKPINGs MnKANIsKA vnniisran, or LIDKPING, SWEDEN.

METHOD .AND MACHINE FOR STRA'IGHTENING OF LETAL WIRE.

Application filed June 7, 1918.

To all 'whom t may concern:

Be it known that I, CARL GUsTAF SDER- LUND, a subject of the King of Sweden, residing' at Hisingen, Gottenborg, in the county oit Gottenborg and Bohus and Kingdom ot Sweden, have invented new and useful lmprovements in Methods and Machines for Straightening of Metal lllire, ot which the following is a speciiication.

The present invention relates to a method for straightening metal wire, while thesame is being unwound from a spool, and a machine for performing the method. By the method the wire, while being unwound from a spool is drawn through a plurality of successively arranged draw blocks each provided with a draw hole, the diameter' of which equals or is very little larger than that of the wire, and said draw blocks are positioned in such a way relative to a common aXis, that the wire, when passing through the draw holes, will be twisted along a helical .line having a rather large pitch, and the draw blocks during this movement of the wire are made to revolve about the said axis.

In the accompanying drawing there is shown a machine for the performance of this method.

Figure 1. illustrates a side view partially in longitudinal section of a portion oit the machine.

Fig. 2. is a plan view of the important parts of the machine.

Fig. 3. is a view of the same parts partly in section.

Fig. 4 is a diagrammatical view showing` the relative positions of the drawing blocks.

Fig. 5. is a section of a detail of the machine. and showing one ot the drawing blocks.

Figs. i2 and 3 are drawn on a smaller scale than that ot the other figures.

The draw blocks 1 are by means of screws 2. positioned within an open ended tube or sleeve 3, which is rotatably mounted in ballbearings 4 and 9 carried by a casing The tube 3 is at one end provided with a belt pulley "6 which is secured to the inner ring of the ball-bearing 9 by means of a collar i7 screwed. onl the tubef.` TheV inner ring Specification of Letters Patent.

Patented Jan. 6, 1920.

Serial No. 238,736.

of ring l at the other end of the tube 3 is secured by means of a collar 14. The draw blocks 1 are each provided with a passage way or draw hole 8, the diameter of which is the same or a very little larger than the diameter of the wire 15 to be straightened and these draw blocks may be moved transversely to the longitudinal axis ot the tube 3, by rotating the screws 2. By this construction each `of the draw blocks may be adjusted independent of each other to suitable distances relative to the longitudinal axis of the tube 3. llhe screws 2 pass through holes in the wall of the tube 3, which holes are arranged in pairs along two helical lines in the tube 3. By these means the draw blocks 1 can be adjusted relative to one another, so that the pitch of the helical line of the passageways or draw holes 8 may be varied relative to the longitudinal axis ot' the tube. The casing 5 is mounted in bearings 16 and is provided at one end with a. collar 10. The casing 5 is provided at its opposite end with a toothed gear 11 and bracket arms 12. These arms carry the spool 18 upon which the wire coil l5a is wound.

The machine operates as follows- The wire 15, from the coil 15a is drawn through the holes or passageways 8 of the blocks 1, by means of any suitable device (not shown on the drawing), and during this movement of the wire the tube 3 with the draw blocks 1 is rotated by means of the belt pulley 6. As the wirepasses through the holes 8 it will be twisted along a helical line defined by the positions of the draw blocks 1, and this twisting movement added to the 'wearing action caused by the edges ot the revolving walls of the draw holes, results in straightening the wire. In order to prevent the wire from twisting as it is unwound from the spool 1?), the casing 5 arms 12 and the spool 13 are rotated about an axis perpendicular to the axis of the spool 13. This rotation is caused by suitable means (not shown) revolving the gear 11. Suitable gearing (not shown) is provided between the gear 11, pulley 6 andthe wire drawing means to insure the proper relative speeds ot these parts, so 'that the wire will be properly untwisted as it is drawn through the tube 3. A certain relative rotation must occur between the spool 13 and the casing 3 with draw blocks 1 owing to the fact that, when a wire is wound around a spool, there will always occur a twisting of the wire on account of the tension in the material. `When such a wound wire is afterward unwound from the spool this tension will remain in the material owing to the force of which the wire has sustained during the time the wire has stood Wound, so that the wire when unwound will not depart from th'e spool in a straight line but in the shape of a helix of somewhat the same diameter as the spool proper. To remove this tendency it is usual, even when unwinding by hand, to revolve the spool about an axis perpendicular to the axis, around which the spool must be revolved to unwind the wire. The presentA machine achieves this removing of the twisting strain mechanically by means of the gear 11. It is not possible to exactly determine the revolving speed of the spool necessary to remove the said twisting tendency, as that belongs materially to the strain set up in the wire, when originally winding the wire upon the spool. Therefore the applicant cannot define this position more exactly, than to state, that a revolving of the spool about an axis parallel to the revolving axis of the casing 3 must be achieved with a speed, that is of a certain velocity, relative to the revolving speed of the casing 3 itself. The characteristic feature lies in the fact, that the spool 13 and the casing 5 are both revolved around parallel axes, or rather a common axis, but with different speeds, which stand in such relation to each other, that any twisting tendenc in the wire will be fully removed. The draw blocks 1, by means of the screw 2 can be adjusted in such relative positions that the helical line through the centers of the draw holes 8, may assume a pitch from a maximum positive amount to a maximum negative amount. By this means the wearing action on the wire set up by edges of the draw holes and the straightening and polishing action upon the wire may be varied. By maximum positive amount and maximum negative amount there it is to be understood that the blocks 8 can be varied in their relative posit-ions, so that the helix formed by the wire when dra-wn through the displaced blocks 8, can be given either a right handed pitch or a left handed pitch, and both these pitches of such a large measure. The reason for this varying of the pitch from the maximum right handed pitch over the straight line (e. g. the pitch neither right handed nor left handed) on to the maximum left handed pitch, is to permit the polishing action set up on the surface of the wire to be varied between Wide limits. The polishing action will impart to the wire a certain degree of stiffness and elasticity, which is very desirable for certain purposes.

Having now particularly described and ascertained the nature of the said invention and in what manner the same is to be performed, what I claim as new to get protected by Letters Patent is:

1. A method for straightening wire, consisting in drawing the wire through helically arranged passageways of successively arranged revolving draw blocks.

2. A method for straightening wire while the same is being unwound from a coil, consisting in drawing the wire through spirally arranged passageways of successively arranged revolving draw blocks, and simultaneously turning the coil about the longitudinal axis of the spirally arranged apertures.

3. A method for straightening wire while the same is being unwound from a coil, consisting in drawing the wire lengthwise and simultaneously subjecting the same to the action of helically arranged revolving annular edges.

4;. A method for straightening wire while the same is being unwound from a coil, consisting in drawing the wire lengthwise and simultaneously subjecting the same to the action of spirally arranged revolving annular edges, and revolving the coil about the longitudinal axis of the spirally arranged edges.

5. In a machine of the class described, a rotatable tube, and a series of draw blocks successively arranged longitudinally of the tube and each having a passageway arranged parallel to the longitudinal axis of the tube, said blocks being spaced apart and said passageways forming a helical passageway around said longitudinal axis when the tube is not in motion.

6. In a machine as defined in claim 5 a spool for the wire rotatable about an axis perpendicular to the axis of the spool.

7. In a machine as defined in claim 5 means for adjusting said blocks transversely of the tube, whereby the pitch of the helical passageway may be adjusted.

8. A machine for straightening wire comprising a rotatably mounted casing carrying bracket arms movable with the casing, a spool carried by said arms and having its axis arranged perpendicular to the axis of the casing, a tube rotatably mounted in said casing, and having two spirally arranged sets of apertures extending longitudinally of the tube, rotatable screws mounted in said apertures and draw blocks mounted on said screws and having threads engaging the threads of the screws, said draw blocks being successively arranged longitudinally of the interior of the tube and each being provided With passageways extending parallel to the longitudinal axis of the tube, the blocks being spaced apart and the passc Ofe- Ways forming a helical passageway through which Wire is adapted to be drawn.

In testimony whereof I have aiXed my signature 1n presence of tWo Witnesses.

CARL GUSTAF SDERLUND.

Witnesses GUsTAF SCITI, RALF EILSON. 

